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Suillus salmonicolor

[ Basidiomycota > Boletales > Suillaceae > Suillus . . . ]

by Michael Kuo

Suillus salmonicolor is a sticky, dirty orange species of Suillus, associated with jack pine, Virginia pine, and pitch pine in eastern North America. It features a distinctive, glutinous, sheathing ring with a flaring, white, lower edge—along with orange flesh and dark red glandular dots that turn brown to black with age.

By current definitions Suillus salmonicolor is the same as "Suillus subluteus" and "Suillus pinorigidus"—and its relationship to the southeastern species Suillus cothurnatus may well be best represented by an equals sign. However, the group has not been studied with contemporary, DNA-informed methods, and Suillus cothurnatus is separated by its association with different species of pine, along with putative morphological differences that include a less prominent white edge to the ring. Suillus pinorigidus was separated on the basis of its association with pitch pine and its slightly darker colors. Given what has happened so far with Suillus phylogenies (see Kretzer et al., 1996), it is very possible that all of these species will eventually be found to be genetically distinct, and best separated with reference to their mycorrhizal associates.

Suillus intermedius, associated with red pine and eastern white pine, is somewhat similar, but features a yellower cap (especially when young), a narrower, more bracelet-like ring, and cap slime that tastes notably acidic or sour.


Ecology: Mycorrhizal with jack pine, Virginia pine, and pitch pine; growing alone, scattered, or gregariously; late summer and fall; widely distributed east of the Rocky Mountains where the host trees occur. The illustrated and described collections are from Michigan, Kentucky, and Québec.

Cap: 3–8 cm; convex at first, becoming broadly convex; slimy; bald, but often appearing streaked under the gluten; dull coppery orange, with brownish to grayish streaks and discolorations, becoming brownish orange with maturity; the margin at first inrolled.

Pore Surface: At first covered with a thick, orangish to grayish partial veil that is baggy and rubbery, with a white roll of tissue on the lower edge; dull cinnamon orange at first, maturing to deeper brownish orange; not bruising; 1–2 angular pores per mm; not boletinoid; tubes to about 1 cm deep.

Stem: 4–10 cm long; 1–2 cm thick; equal; covered with glandular dots that are dark brownish red at first but become darker (usually brown to black) with age; whitish to yellowish or orangish; with a thick, sheathing, gelatinous, whitish to orangish ring that usually features a whitish roll of tissue at the bottom and, in age, collapses to form a grayish, bracelet-like band.

Flesh: Orangish in cap; darker orange in the stem; deep salmon orange in the stem base; not staining on exposure.

Odor and Taste: Not distinctive.

Chemical Reactions: Ammonia purplish on cap and flesh. KOH purple on cap and flesh. Iron salts negative on cap and flesh.

Spore Print: Cinnamon brown.

Microscopic Features: Spores 7–10 x 2–3.5 µm; fusiform; smooth; yellowish in KOH. Hymenial cystidia fusiform; dark brown in KOH. Caulocystidia fusiform to cylindric or subclavate; dark brown in KOH.

REFERENCES: (Frost, 1874) Halling, 1983. (Singer, 1945; Snell & Dick, 1956; Smith & Thiers, 1964; Snell & Dick, 1970; Smith & Thiers, 1971; Grund & Harrison, 1976; Smith, Smith & Weber, 1981; Halling, 1983; Weber & Smith, 1985; Palm & Stewart, 1986; Both, 1993; Barron, 1999; Bessette, Roody & Bessette, 2000; McNeil, 2006; Miller & Miller, 2006; Ortiz-Santana et al., 2007; Kuo & Methven, 2014.) Herb. Kuo 09241109.

This site contains no information about the edibility or toxicity of mushrooms.


Suillus salmonicolor

Suillus salmonicolor

Suillus salmonicolor

Suillus salmonicolor

Suillus salmonicolor

Suillus salmonicolor

Suillus salmonicolor
Ammonia, KOH, iron salts

Suillus salmonicolor

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Kuo, M. (2016, January). Suillus salmonicolor. Retrieved from the MushroomExpert.Com Web site: